402 
LOGGING 
are connected by a rope or cable which passes around a drum 
or power-wmch located on shore, while on stationary booms 
the fins are weighted at the ends to give them rigidity, and are 
fixed in a permanent position by means of a brace extending 
from the fin to the main boom. 
The boom may be thrown across a stream at any angle less 
than 90 degrees by winding in or letting out the cable, thus in- 
creasing or decreasing the angle between the boom and rudders. 
The boom may be brought to shore by letting out cable. 
Pig. 142. — Piers placed in a River to hold Stoi-age Booms. Minnesota, 
A barge boom is a limber boom, three or four logs wide, the 
upper end of which is fastened to a barge anchored in midstream 
and the downstream end to a tree or stump on shore. A boom 
of this character is serviceable in a navigable stream where per- 
manent booms cannot be used, and where the stream bed can- 
not be obstructed with piling or cribs. It is often used in con- 
nection with a fin boom when it is desired to shunt logs to one 
side of a wide stream. 
STORAGE AND SORTING FACILITIES 
On all large streams on which logs are transported, the timber 
of various companies becomes intermingled and it is neces- 
sary to sort out the property of each owner at destination. For 
this purpose assorting works are maintained at points where 
